Question

If 2.5x10^-3 moles of O2 were produced in the reaction, how many grams of H2O2 had to react?
what reaction??
2H2O2 ==> 2H2O + O2

mols O2 = 2.5E-3
mols H2O2 = 2.5E-3 x (2 mol H2O2/1 molO2) = ?
Then grams H2O2 = mols x molar mass = ?

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